Zoltán Sütő

Zoltán Sütő
Budapest University of Technology and Economics · Department of Automation and Applied Informatics

About

60
Publications
14,217
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257
Citations
Citations since 2017
13 Research Items
62 Citations
2017201820192020202120222023051015
2017201820192020202120222023051015
2017201820192020202120222023051015
2017201820192020202120222023051015

Publications

Publications (60)
Article
The load transient response of a power converter is an important property, especially in a test equipment application. The dynamic behavior of a dual active bridge converter mainly depends on the switching frequency, the transformer leakage inductance, and the capacitor bank size. Using the Continuous Cross-Period Single Phase-Shift control, an exc...
Article
In this paper, we propose a new decentralized control and power-sharing strategy to manage the power flow among energy sources (ESs), energy storage systems (ESSs) and the common dc-link. In the proposed technique, we eliminate all communication among the ESSs, to reduce the complexity and increase reliability, maintaining dc-link voltage restorati...
Conference Paper
Full-text available
The use of real-time Hardware-In-the-Loop (HIL) simulation tools to validate controller implementations is now an essential part of the power electronics control workflow. Despite the fact that the computational power of FPGA devices used by HIL tools is rapidly evolving, designers always have to make a trade-off between acceptable accuracy, implem...
Conference Paper
Full-text available
Nowadays power electronics control design workflow can not be imagined without using real-time Hardware-In-the-Loop~(HIL) simulation tools in the validation of controller implementations. In spite of that the computational power of FPGA devices used by HIL tools is rapidly evolving, developers always have to compromise between the acceptable accura...
Article
Full-text available
Advances in FPGA technology have enabled fast real-time simulation of power converters, filters and loads. FPGA based HIL (Hardware-In-the-Loop) simulators have revolutionized control hardware and software development for power electronics. Common time step sizes in the order of 100ns are sufficient for simulating switching frequency current and vo...
Conference Paper
Full-text available
Nowadays as the technology is developing, the more complex the power electronics and its controls become, the more proper hardware tool is required for HIL (Hardware-In-the-Loop) simulation. The general aim of the presented work is developing a fast, reliable and scalable HIL simulation framework for the rapid prototyping of complex power electroni...
Conference Paper
As switching power converters are becoming widespread, the power quality of inverters and active rectifiers is becoming increasingly important. Effective dead time is a major cause of harmonics in the output current of voltage sourced PWM converters. The traditional dead-time compensation methods can only handle high current operating conditions we...
Conference Paper
Full-text available
The paper as a preface presents five engineering experiences encountered in R&D work in the area of power electronics with nonlinear phenomena. They guided the authors to deepen their knowledges in the advanced theory of nonlinear dynamics. A very brief overview of the theory is included. Two examples show the application of the theory in practice.
Conference Paper
Full-text available
The paper as a preface presents five engineering experiences encountered in R&D work in the area of power electronics with nonlinear phenomena. They guided the authors to deepen their knowledges in the advanced theory of nonlinear dynamics. A very brief overview of the theory is included. Two examples show the application of the theory in practice.
Conference Paper
Full-text available
The scope of the paper is to reveal the strange behavior of Direct Torque Controlled (DTC) drives resulting from the nonlinearity of hysteresis comparators. A piecewise-defined, non-stroboscopic, discrete-time Poincare¿ map can be constructed for the system which takes into account the fast switching operations of the Voltage Source Converter (VSC...
Conference Paper
Full-text available
The "dream island" Djerba (Tunisia) has been selected to host the sixth edition of SSD. Djerba is well known for its exceptional landscapes, beaches, and hotels. It is one of the few remaining places in Tunisia where the original Berber language "Shelha" is still spoken. Jerba is well connected to different airports in Europe and worldwide by its o...
Article
The scope of the paper is the strange behavior of direct torque controlled (DTC) induction machine (IM) resulting from the nonlinearity of hysteresis comparators. A piecewise-defined, non-stroboscopic, discrete-time Poincare map can be constructed for the system. The movement of the two controlled state variables, the stator flux linkage and the el...
Conference Paper
Full-text available
The paper presents briefly the concepts, the targets and some of the methods, approaches applied, results reached in two European e-learning projects. Both projects were supported by the European Union and participants from more than 10 European countries had been working in them mostly from Universities. The projects exploits the rich possibilitie...
Conference Paper
Full-text available
The source of nonlinearity are the hysteresis comparators and dependence of switchings on state variables in direct torque controlled (DTC) induction machines (IM). The nonlinearity generates some strange operation states. They are revealed, analyzed by bifurcation diagram and recurrence plots both in motoring and generating operations.
Conference Paper
Full-text available
The aim of the paper is to give an overview of the activities in one of the recent fields of nonlinear dynamics in power electronics where the main building block is the three-phase Voltage Source Converter (VSC). The paper briefly summarizes the results published in other area of power electronics in nonlinear dynamics such as DC–DC and single-pha...
Conference Paper
Full-text available
The paper is concerned about R & D projects in renewable energy utilization. The general system developed is suitable for the utilisation of both waste and renewable energy sources. Two applications are discussed. The first system is proposed for converting an increased portion of the energy, obtained from solar radiation into electric energy. The...
Conference Paper
Full-text available
The paper first briefly summaries and highlights the colorful world of nonlinear dynamic systems for those who are not familiar in it. In the second part it presents the overview of the results obtained by the analysis of two frequently employed nonlinear controlled electric drives
Conference Paper
The strange behavior of Direct Torque Controlled (DTC) Induction Machine (IM) due to nonlinearity is studied. The nonlinearity is the result of hysteresis comparators. Recurrence Plots (RP) beside the bifurcation diagram are applied to reveal the possible states of the system such as periodic, subharmonic and chaotic states. RP makes it possible to...
Conference Paper
Full-text available
Signal processing is one of the key elements to have the power electronics systems operated. Its application is inevitable in switching of power electronics devices, protection, control, supervision etc. The current paper is devoted to present browser-based multimedia-rich curriculum and software tools on this field completed by the inherent nonlin...
Conference Paper
Full-text available
The nonlinear behaviour of direct torque controlled (DTC) induction machine (IM) is studied. The nonlinearity is due to the dependence of the switching instants on the state variables. The aim is to derive analytical relations for the determination of the time evolution of state variables and on that basis to reveal the possible states of the syste...
Conference Paper
The nonlinear behaviour of direct torque controlled (DTC) induction machine (IM) is studied. The nonlinearity is due to the dependence of the switching instants on the state variables. The aim is to derive analytical relations for the determination of the time evolution of state variables and on that basis to reveal the possible states of the syste...
Conference Paper
Full-text available
The nonlinear phenomena of direct torque controlled (DTC) induction machine (IM) is investigated. Since the system is strongly nonlinear due to the hysteresis comparators, various nonlinear phenomena are expected. The objective of the paper is the study of these behaviors, exploring various system states from regular periodic operations to chaotic...
Conference Paper
Full-text available
The first part of the paper gives a bird-eye view of the state of the art of nonlinear dynamics emphasizing the new class of phenomena called chaos. The second part describes briefly three examples from the field of nonlinear power electronic systems exhibiting surprising properties.
Article
Full-text available
The analysis, design aspects, and numerical results of a current-controlled three-phase space-vector-modulated (SVM) voltage-source converter (VSC) are presented. The aim of the current controller of the VSC is to track the sinusoidal reference currents in each phase. The current controller includes a complex saturation function in order to avoid o...
Conference Paper
Full-text available
The analysis, design aspects and numerical results of a current controlled three-phase space vector modulated (SVM) voltage source converter (VSC) are presented. The aim of the current controller of VSC is to track the balanced three-phase sinusoidal reference currents. The current controller includes a complex saturation function in order to avoid...
Conference Paper
Full-text available
The analysis and numerical results of a current controlled three-phase Space Vector Modulated (SVM) Voltage Source Converter (VSC) are presented. The aim of the current controller of VSC is to track the sinusoidal reference currents in each phase. The current controller includes a saturation function in order to avoid overmodulation in the SVM. Due...
Conference Paper
The voltage source, three phase, full bridge converter furnished with a sophisticated hysteresis current control loop can be in fundamental periodic state, in chaotic state and transition states between the two. After summarizing the background information, the paper highlights one of the transition states of the system, the period adding scenario....
Conference Paper
A three-phase full bridge converter is the work-horse in static power processing both in AC-DC and in DC-AC conversion. This converter-type furnished with a sophisticated hysteresis current control loop can exhibit periodic, subharmonic and chaotic responses. After summarizing the background information, the paper presents a comparative study of be...
Article
The paper is concerned with the additional voltage stress in the field winding of turbine-generator produced by a thyristor exciter. In few cases, the insulation of field winding was damaged within a short time (some months) after commissioning the static exciters, although previously these rotors were in service with a DC rotating exciter without...
Conference Paper
The workhorse in static electric power processing both in AC-DC and in DC-AC power conversion is the three-phase full-bridge power converter. This paper is concerned with the strange behaviour of the tolerance band AC current control of a three-phase full bridge AC-DC power converter with six controlled switches and a high filter capacitor on the D...
Conference Paper
The main objective of the paper is to highlight the strange and complex behaviour of a motor drive consisting of a three-phase induction machine fed by a voltage source inverter (VSI) and controlled by a hysteresis current controller (HCC). This system exhibits either periodic, subharmonic or chaotic trajectory movements, and shows bifurcation phen...
Article
The objective of the paper is to highlight the chaotic behaviour of a type of motion control system. Its main component is a Voltage Source Inverter (VSI) with its Hysteresis Current Controller (HCC). The inverter supplies an induction motor. Although the motor can be modelled by linear state equation, the overall system is strongly nonlinear becau...
Conference Paper
Full-text available
The paper first describes the configurations and the basic concept of the operation of a fairly new resonant converter family including step-down, step-up, and step up and down circuits. The family has twelve variations. One of them can be operated as a current generator without any additional control circuit, provided that the input voltages and t...
Conference Paper
Motion control has been a fruitful ground for applying variable structure systems (VSS) theory. This paper provides an assessment of the state of the art of the relevant theoretical results for motion control, and through a number of control design problems (namely classical, discrete-time, observer based discrete-time and frequency shaped discrete...
Conference Paper
Full-text available
The paper is concerned with the periodic and chaotic responses of a simple drive consisting of an induction motor supplied by a voltage source inverter and controlled by a tolerance band current controller. After mathematical modelling of the drive and a survey of the two hysteresis current control method, strong nonlinear behavior is highlighted....
Conference Paper
Full-text available
The strange behavior of the induction motor supplied by a voltage source inverter and controlled by a tolerance band current controller is analyzed. Discrete modeling is developed for the description of system. Numerical results presented in the form of Feigenbaum or final state diagram and in Poincaré map show that the system response can be perio...
Conference Paper
Full-text available
A newly developed technique, the predictive adaptive switching pattern (PASP), applied for tolerance band (TB) current control of an induction machine supplied by a voltage source inverter (VSI) is presented. This technique is based on the so called regular switching pattern (RSP) and its improved version the adaptive switching pattern (ASP). ASP w...
Article
A változó struktúrájú rendszerek témában az egyik kutatási eredmény e rendszerek stabilitására vonatkozik. A fix pontjhoz tartozó Poincaré térkép függvény Jakobi mátrixának a sajátértékeit alkalmazza és grafikus támogatással szemléletesebbé, egyszerűbbé teszi a számitást. Kihasználja a struktúra sorozat periodicitását, ezzel átláthatóbb, gyorsabb e...
Article
A jelen pályázat célja az volt, hogy újszerű megoldásokat dolgozzunk ki a napenergia hasznosítására, villamos illetve hőenergia termelés céljából, környezetbarát módon. A legtöbb esetben mind hő, mind villamos energiára szükség van, ezért olyan megoldást kutattunk, amellyel a fotovillamos és termikus kollektor technológiát egyesíteni lehet. A rends...

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